If things seem weird, maybe you didn't get rid of the original virus completely? If you go to
Norbiesworld & register, then follow the instructions for free computer help, Norbie will be able to check out your computer & help you to fix any problems.
I don't know anything about reformatting. Try Norbiesworld & see what he says. If you download Hijackthis & post the log in the Viruses, Trojans & Spyware section of the forum then Norbie will have a look & get back to you